harmony 鸿蒙button

2022-08-09
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button

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

The <button> component includes capsule, circle, text, arc, and download buttons.

Child Components

Not supported

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Default Value	Mandatory	Description
type	string	-	No	Button type. The value cannot be dynamically updated. By default, a capsule-like button is displayed. Unlike the capsule button, the capsule-like button allows its corners to be configured using border-radius. The options are as follows: - capsule: capsule button with fillets, background color, and text. - circle: circle button that can accommodate icons. - text: text button, which displays only text. - arc: arc button. This value is applicable to wearables only. - download: download button, with an extra download progress bar.
value	string	-	No	Text value of the button.
icon	string	-	No	Path of the button icon. The supported icon formats are JPG, PNG, and SVG.
placement⁵⁺	string	end	No	Position of the button icon in text. This attribute is valid only when type is not set. Available values are as follows: - start: The button icon is at the beginning of the text. - end: The button icon is at the end of the text. - top: The button icon is at the top of the text. - bottom: The button icon is at the bottom of the text.
waiting	boolean	false	No	Waiting status. When this attribute is set to true, a loading animation is displayed on the left of the text. This attribute does not work for download buttons.

Styles

When the Button Type Is Not arc

In addition to the universal styles, the following styles are supported.

Name	Type	Default Value	Mandatory	Description
text-color	<color>	#007dff	No	Text color of the button.
font-size	<length>	16px	No	Font size of the button.
allow-scale	boolean	true	No	Whether the font size changes with the system’s font size settings. If the config-changes tag of fontSize is configured for abilities in the config.json file, the setting takes effect without application restart.
font-style	string	normal	No	Font style of the button.
font-weight	number \|string	normal	No	Font weight of the button. For details, see font-weight of the <text> component.
font-family	<string>	sans-serif	No	Font family, in which fonts are separated by commas (,). Each font is set using a font name or font family name. The first font in the family or the specified custom font is used for the text.
icon-width	<length>	-	No	Width of the internal icon of a circle button. The entire circle button is filled by default. This style must be set when the icon uses the SVG image.
icon-height	<length>	-	No	Height of the internal icon of a circle button. The entire circle button is filled by default. This style must be set when the icon uses the SVG image.
radius	<length>	-	No	Corner radius of the button. For a circle button, this style takes precedence over width and height in the universal styles.

When the Button Type Is arc

In addition to the background-color, opacity, display, visibility, position, and [left|top|right|bottom] styles in Universal Styles, the following styles are supported.

Name	Type	Default Value	Mandatory	Description
text-color	<color>	#de0000	No	Text color of the arc button.
font-size	<length>	37.5px	No	Font size of the arc button.
allow-scale	boolean	true	No	Whether the font size changes with the system’s font size settings.
font-style	string	normal	No	Font style of the arc button.
font-weight	number \|string	normal	No	Font weight of the arc button. For details, see font-weight of the <text> component.
font-family	<string>	sans-serif	No	Font family, in which fonts are separated by commas (,). Each font is set using a font name or font family name. The first font in the family or the specified custom font is used for the text.

Events

The universal events are supported.

Methods

The universal methods are supported.

When the button type is download, the following methods are supported.

Name	Parameters	Description
setProgress	{ progress:percent }	Progress bar of the download button. The value ranges from 0 to 100. The progress bar is displayed if the value is greater than 0. If the value is greater than or equal to 100, the progress bar is not displayed. The text displayed on the progress bar is subject to the value settings.

Example

<!-- xxx.hml -->
<div class="div-button">
  <button class="first" type="capsule" value="Capsule button"></button>
  <button class="button circle" type="circle" icon="common/ic_add_default.png"></button>
  <button class="button text" type="text">Text button</button>
  <button class="button download" type="download" id="download-btn"
    onclick="progress">{{downloadText}}</button>
  <button class="last" type="capsule" waiting="true">Loading</button>
</div>

/* xxx.css */ 
.div-button {
  flex-direction: column;
  align-items: center;
}
.first{
  background-color: #F2F2F2;
  text-color: #0D81F2;
}
.button {
  margin-top: 15px;
}
.last{
  background-color: #F2F2F2;
  text-color: #969696;
  margin-top: 15px;
  width: 280px;
  height:72px;
}
.button:waiting {
  width: 280px;
}
.circle {
  background-color: #007dff;
  radius: 72px;
  icon-width: 72px;
  icon-height: 72px;
}
.text {
  text-color: red;
  font-size: 40px;
  font-weight: 900;
  font-family: sans-serif;
  font-style: normal;
}
.download {
  width: 280px;
  text-color: white;
  background-color: #007dff;
}

// xxx.js
export default {
  data: {
    count: 5,
    downloadText: "Download"
  },
  progress(e) {
    this.count+= 10;
    this.downloadText = this.count+ "%";
    this.$element('download-btn').setProgress({ progress: this.count});
    if (this.count>= 100) {
      this.downloadText = "Done";
    }
  }
}